Problem: no macOS support

[yrashk]

Solution: install tailscale from homebrew

Also, there's no /etc/hostname so I just called hostname

[willnorris]

I'm a little hesitant to use homebrew to install tailscale, since we don't really have any control of how it's distributed. That said, the formula is part of homebrew-core (rather than a user-hosted cask), and it's just building from source anyway, so should be fine: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/t/tailscale.rb

I'll need to sort out the build errors before merging.

[jgautsch]

This is highly desirable for my use case!

[willnorris]

Fixed in #161